百度知道 - 信息提示

你着急也没用我这个也不会

1. It remains a mystery why dinosaurs died out suddenly long time ago. 2. It has not been decided whether we will travel abroad or not. 3. We find it important to learn a second language. 4. We think it our duty cleaning the classroom every day. 5. 倒装句：Not until his father came back did Tom went to sleep. 强调句：It was not until his father came back that Tom went to sleep. 6. Canada has more fresh water than the other countries in the world. 或：Canada has more fresh water than any other country in the world. No other country in the world has more fresh water than Canada. 或：No other countries in the world have more fresh water than Canada. 7. China is the largest country in Asia. China is larger than any other country in Asia. China is larger than the other countries in Aisa. No other country is larger than China. No other countries are larger than China. 8. With time going by, he gradually realized his mistake. 9. Our new house is four times as big/large as the old one. 或：Our new house is four times bigger/larger than the old one. 10. It is well-known that English plays an important part in our daily life. 后面的被动句和同义句，楼主已经有正确答案了，还问什么呢？